RHCSA
862 incident response problems that help with RHCSA prep.
먼저 읽을 가이드
추천 문제
All problems (862)
LINUX-030Process limit reached by short-lived workers instead of main appThe service owner blames the main process, but the true limit is exhausted by a burst of helper processes spawned underneath.LinuxIntermediate19 minFreeLINUX-032Systemd service starts manually but fails on boot without network-online targetThe unit runs when started interactively, yet boot-time startup fails because dependency ordering assumes the network is ready earlier than it actually is.LinuxIntermediate19 minFreeLINUX-012A tmp directory cleanup policy that intermittently breaks only upload processingA tmp directory cleanup policy that intermittently breaks only upload... is a hands-on troubleshooting drill. A situation where a batch cleanup task collides with the application's temp files, breaking only a specific feature. Azure Linux Storage and Filesystems needs to be ch...LinuxIntermediate20 minFreeLINUX-074Boot stalls on a dead NFS mountThe host itself is healthy, but boot takes far too long because a remote mount is treated like a local dependency and blocks the sequence.LinuxBeginner13 minFreeLINUX-024File exists but service user cannot follow parent directoryFile exists but service user cannot follow parent directory is a hands-on troubleshooting drill. The file permission looks fine, but one directory in the path denies execute permission and breaks access. Azure Linux Service Operations needs to be checked by narrowing scope, re...LinuxBeginner14 minFreeLINUX-060Package manager lock remains after a dead process and blocks patch automationThe scheduled patch job says another package process is running, but the real blocker is an abandoned lock or stale transaction state from an older failure.LinuxBeginner14 minFreeLINUX-038Sudoers drop-in order silently reintroduces password promptsThe main sudoers file looks correct, but a later drop-in overrides the intended NOPASSWD rule and breaks the automation path.LinuxBeginner14 minFreeLINUX-082systemd service restarts foreverThe unit logic looks sensible, but rapid restart attempts fail because the old process has not released the listening resource before the next launch begins.LinuxIntermediate14 minFreeLINUX-069Unattended patch job failsPackage metadata is reachable, but only one channel refuses updates because its signing key aged out and the automation never refreshed the trust path.LinuxBeginner14 minFreeLINUX-021Cron job runs manually but fails under non-login shellCron job runs manually but fails (404 and Rewrite Mismatch) is a hands-on troubleshooting drill. The command succeeds interactively but breaks in cron because environment setup and path assumptions are missing. Azure Linux Service Operations needs to be checked by narrowing sc...LinuxBeginner15 minFreeLINUX-064systemd socket activation still listens on the old port after only the service unit changedThe binary and service file look updated, but clients still hit the previous port because the socket unit remained the real source of truth.LinuxIntermediate15 minFreeLINUX-004An open log-file problem where space is not freed even after logrotate runsCovers a common operational trap where swapping the log file without restarting the service still does not free space.LinuxBeginner18 minFreeLINUX-036Journald rate limiting hides a flapping service patternThe service restarts repeatedly, but the most useful logs never appear because journald is suppressing the repeated messages during the worst part of the incident.LinuxIntermediate20 minFreeLINUX-1787A logrotate file is valid and one log still growsA log still grows after logrotate cleanup.LinuxBeginner8 minFreeLINUX-1707A logrotate policy is valid and one file still growsA file still grows after logrotate was fixed.LinuxBeginner8 minFreeLINUX-1687A logrotate rule is valid and one file still growsA log file still grows after a logrotate cleanup.LinuxBeginner8 minFreeLINUX-1697A logrotate rule is valid and one file still growsA log file still grows after a logrotate cleanup.LinuxBeginner8 minFreeLINUX-1727A logrotate rule is valid and one file still growsA log file still grows after a cleanup.LinuxBeginner8 minFreeLINUX-1737A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFreeLINUX-1747A logrotate rule is valid and one file still growsA log file still grows after cleanup.LinuxBeginner8 minFree